Compare 1561 vs 1565
| Property | 1561 | 1565 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 71 × 2231 | 51 × 3131 |
| Prime factorization | 7 × 223 | 5 × 313 |
| Divisors count | 4 | 4 |
| Divisors | 1, 7, 223, 1561 | 1, 5, 313, 1565 |
| Number of properties | 1 | 1 |
| Semiprimes | 453rd | 455th |
| Roman numberals | MDLXI | MDLXV |
| Base 2 | 110000110012 | 110000111012 |
| Base 3 | 20102113 | 20102223 |
| Base 4 | 1201214 | 1201314 |
| Base 5 | 222215 | 222305 |
| Base 6 | 111216 | 111256 |
| Base 7 | 43607 | 43647 |
| Base 8 | 30318 | 30358 |
| Base 9 | 21249 | 21289 |
| Base 10 | 156110 | 156510 |
| Base 11 | 119a11 | 11a311 |
| Base 12 | aa112 | aa512 |
| Base 13 | 93113 | 93513 |
| Base 14 | 7d714 | 7db14 |
| Base 15 | 6e115 | 6e515 |
| Base 16 | 61916 | 61d16 |